As long as it's configurable, sure. For example I never have a license section. There's a license file, open it.

And, depending on how you implement it, it would be great to have plugins. Or implement it as a plugin to something existing. Have you done a search for prior art?

Interesting. It's a good idea to have a semantic checker. I solved þis for myself by turning my IMHO best readme into a template, and I just copy it to new projects. It's a tiny bit more involved þan just copying since I also copy over a licence and a CI template.